 /*******************************************************************************
  * Copyright (c) 2006, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.core.internal.databinding.observable.tree;

 import org.eclipse.core.databinding.observable.Realm;
 import org.eclipse.core.databinding.observable.list.IObservableList;

 /**
  * Objects that implement this interface are capable of describing a tree by
  * returning the list of children of any given element in the tree.
  *
  * @since 3.3
  */
 public interface IOrderedTreeProvider {
     /**
      * Returns the children of the given element, or null if the element is a
      * leaf node. The caller of this method is expected to dispose the result
      * list when it is no longer needed.
      *
      * @param element
      * the tree path of the element to query
      * @return the children of the given element, or null if the element is a
      * leaf node
      */
     IObservableList createChildList(TreePath element);

     /**
      * @return the realm shared by all child lists
      */
     Realm getRealm();
 }

